There has never been that amount of sun in Wales
I’d imagine that it’s the local tourist board that decides, and it’s whatever they think will attract the most tourists (athletes).
Probably a negotiation. IM will want to attract athletes. Local/county councils to advertise themselves.
If they align, perfect. But I don’t for 1 second imagine the ‘Sir Benfro’ Welsh word for Pembrokeshire that appears with IM Wales these days came from IM.
I wonder what Hull would call their Ironman, hypothetically…